feat: message box dynamic sizing, documentation page updates

programs/src/test_dialogs/main.cpp

@@ -8,8 +8,13 @@
 #include <gui/dialogs.hpp>
 
 extern "C" void _start() {
-    gui::dialogs::message_box("Test Dialogs",
-                              "Hello from libdialogs::message_box.",
-                              gui::dialogs::MESSAGE_BOX_OK);
+    auto result = gui::dialogs::message_box(
+        "Close Document",
+        "Discard unsaved changes?",
+        gui::dialogs::MESSAGE_BOX_YES_NO_CANCEL);
+
+    if (result == gui::dialogs::MESSAGE_BOX_RESULT_YES) {
+        /* discard and close */
+    }
     montauk::exit(0);
 }